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首页> 外文期刊>Harmful Algae >Gambierdiscus jejuensis sp. nov., an epiphytic dinoflagellate from the waters of Jeju Island, Korea, effect of temperature on the growth, and its global distribution
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Gambierdiscus jejuensis sp. nov., an epiphytic dinoflagellate from the waters of Jeju Island, Korea, effect of temperature on the growth, and its global distribution

机译：济州甘比氏菌十一月，来自韩国济州岛水域的附生鞭毛藻，温度对其生长的影响及其全球分布

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摘要

The genus Gambierdiscus produces ciguatera toxins, which has led to extensive studies of this genus. Epiphytic dinoflagellate cells were isolated from coralline macroalgae collected from the coastal waters of Jeju Island, Korea, and two clonal cultures were established. The morphology of these cells was examined using light and scanning electron microscopy, and the sequences of the small subunit (SSU), large subunit (LSU), and internal transcribed spacer (ITS) region of rDNA were determined. The phylogenetic trees based on SSU, LSU (D1-D3), and LSU (D8-D10) rDNA showed the two Korean isolates forming a Glade with unidentified strains named Gambierdiscus sp. type 2. This Glade showed a clear divergence from the two closest clades containing of the G. caribaeus and G. carpenteri strains. Morphologically, the Korean isolates had an anteroposteriorly compressed cell shape having a smooth theca ornamentation. Growth of the Korean isolates ceased when water temperatures were 20 degrees C or 30 degrees C with an optimum at 26 degrees C. This temperature preference may account for why Gambierdiscus sp. type 2 has only been isolated from the temperate waters of Korea and Japan. However, the two most closely related species G. caribaeus and G. carpenteri have broader temperature ranges tolerating as high as 34-36 degrees C and are globally distributed. Based on these results, the Korean isolates are proposed as a new species in the genus Gambierdiscus and named Gambierdiscus jejuensis sp. nov. Furthermore, it is suggested that the unidentified strains belonging to the Gambierdiscus sp. type 2 be transferred to the new species, G. jejuensis.
机译：Gambierdiscus属产生雪茄毒素，这导致对该类的广泛研究。从韩国济州岛沿海水域收集的珊瑚大型藻中分离出附生的鞭毛藻细胞，并建立了两种克隆培养物。使用光和扫描电子显微镜检查这些细胞的形态，并确定rDNA的小亚基（SSU），大亚基（LSU）和内部转录间隔区（ITS）区域的序列。基于SSU，LSU（D1-D3）和LSU（D8-D10）rDNA的系统进化树显示，这两个韩国分离株与未鉴定的菌株Gambierdiscus sp形成了Glade。 2型。该Glade与包含Caribaeus和Carpenteri菌株的两个最接近的进化枝有明显的差异。从形态上讲，韩国分离株具有前后压缩的细胞形状，具有光滑的卵泡膜装饰。当水温低于20摄氏度或> 30摄氏度（最适温度为26摄氏度）时，韩国分离株的生长便停止了。这种温度偏爱可能解释了为什么Gambierdiscus sp。 2型仅从韩国和日本的温带水域中分离出来。然而，两个最密切相关的物种G. caribaeus和G. carpenteri具有更宽的温度范围，可承受高达34-36摄氏度的温度，并且在全球范围内分布。基于这些结果，韩国分离株被提议为甘比氏菌属中的新物种，并命名为甘比氏菌济州种。十一月此外，建议属于甘比氏菌属的未鉴定菌株。将类型2转移到新种济州种。

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